^^Yes, the T4 will spool a bit slower than the T3. I would assume probably about another 100-200 rpm slower than the T3 6265, but the top end should be bit more than the T3 6265 or 6262, maybe 10-20 whp. because of the larger T4 housing. Full spool with the T4 6265 will probably be around 5600-5700 rpm as apposed to the T3 6265 fully spooled at around 5500 rpm.

 

When I first put the car together I was using a Precision PT6765 with the cast wheel. When Precision came out with Billet turbos they sent me a HP-6265 Billet ball bearing to test & the car made more power with the 6265 than the 6765 cast wheel.

My car made 835whp on C16 with the Precision HP-6265 billet ball bearing

Sorry for thread jack, but just wanted to clear that up.

Nice numbers by the way! Keep up the good work


Fernando